Gage for chisels.



E. E. TAFT.

GAGE FOR CHISELS.

APPLICATION FILED 00113, 1914.

Patented July 25, 1916. A

wbb/momo I IISIMILI.

'EDWARD E. ,TAF'IQ OF FORT DODGE, IOWA.

eeen. ron oHIsELs.

Specification of Letters Patent.

Application filed October 13, 1914. Serial No. 866,466.

To all 'w hom it may concern Be it known that I, EDWARD E. TAFT, a citizen of the United States, residing at Fort Dodge, in the county of Webster and State of Iowa, have invented new and useful Improvements in Gages for Chisels, of which the following is a specification.

This invention relates to a gage for use upon chisels and particularly those chisels which are commonly known as "butting chisels and which are used for cutting out mortises in doors for the reception of the leaves of butt hinges, the primary object being to provide a gage which may be used upon chisels of this character to gage and limit the movement of the chisel 'blade so that the mortise will be cut out in the exact proportion desired.

In a co-pending application, iledfSeptember 2, 19111, Serial No. 859,845 a gaging and cutting tool for use in executing thefshallow side cuts of a butt' mortise is disclosed, and it is intended that the gage device embodied inthe present application shall be used upon a chisel in cutting out the portion of wood remaining between the side cuts of a buttmortise to complete the operation commenced by the gaging and cutting instrument just mentioned.

A further object of the invention is to provide a gage device whose parts are readily and accurately adjustable and which may be mounted detachably upon a chisel for use in gaging any desired cut, and also to provide a device which is composed of few parts of simple and inexpensive construction.

The invention consists in the features of construction, combination, and arrangement of parts, hereinafter fully described and claimed, reference being had to the accompanying drawings in which:

Figure 1 is a perspective view of a butting chisel in use in mortising a door, showing the companion gage devices mounted upon the chisel; Fig. 2 is a side elevation of the chisel and gage devices, showing the limiting lug of the visible gage device in engagement with the door at the end of the cutting operation; Fig. 3 is a front elevation of one of the gage devices; and, Fig. 4 is a top plan view of the same.

In the drawing, the numeral 1 designates a hutting chisel, which is adapted 'peculiarly for use in cutting out the portion 2 of the wood in the door 3 which is disposed between 'the side cuts 4 of the butt mortise. Companion gage devices for use in determining the depth of the cut to be made by thechisel are shown as being mounted upon the opposite side edges of the same.

Each gage device is constructed preferably of metallic parts, and includes a flat, elongated body 5, which is to be mounted detachably upon the front face of the chisel blade contiguous to one side edge of the same, the front face being, in this instance, the face corresponding to the beveled/ face 6 ofthe cutting edge of the blade. A broad flat hook 7 is formed upon the outer side edge of the body 5 and has its inwardly projecting bill 8 disposed in parallel relation to the body and spaced therefrom at a distance exceeding the thickness of the chisel blade for engagement with the rear face of the latter. 'A tapered wedge 9 1s mounted for vertical adjustment upon the rear face of the body 5 and is adapted to be interposed between the same and the front face of the chisel blade. A headed retaining pin 10 is mounted upon the wedge for sliding engagement -within a vertical slot 11 in the body 5. A set screw 12 is mounted within the ybody for engagement with the wedge, whereby the latter may be secured in adjusted position when the gage device is mounted upon the chisel blade and the wedge is tightened. The wedge is disposed preferably with its larger end uppermost in order that it may be driven conveniently into its tightened, locking position. A rearwardly projecting limiting lug or stop 13 is formed upon the outer side edge of the body 5, below the hook 7 and is likewise adapted to engage the correspending side edge of the chisel blade. This limiting lug may be set at the proper position upon the chisel blade by adjustment of the body of the gage device to determine the effective length of the blade in each particular instance. Vertically spaced supporting arms 14 and 15 project outwardly from the front face of the body 5 at right angles thereto. These arms are provided with longitudinal and thus horizontally disposed slots 16 and 17 respectively, which are adapted to aline with the longitudinal slot 18 provided in a vertically elongated gage member 19. Clamping bolts 20 and 21 are adapted to be mounted within the arm slots 16 and 17 respectively andthe slot 18 of the gage member, whereby the latter may be Patented July 25, i916.

secured in adjusted position with relation to the body 5. A longitudinally extending iange 22 is provided upon the gage member at its lower end and projects rearwardly therefrom. This ilange is provided with an outwardly projecting guiding portion 23 which is to be arranged parallel to the rear face of the chisel blade and in proper spaced relation thereto when used in completing the cutting of any particular butt mortise.

When the gage devices are mounted upon the chisel blade, they are adjusted so that the limiting lugs 13 are disposed with their lowermost active edges spaced from the cutting edge Y of the blade at a distance equal to the width of the mortise in order that the said lugs will engage the adjacent face of the door immediately upon completion of the cutting operation to prevent excessive movement of the 'chisel blade. Then the body of each gage device is secured fixedly upon the blade by driving the wedge downwardly and then locking the same with the set screw provided for the purpose. Then the gage member proper of each gage device is set and bolted in such a position that the guiding portion of its lug 22 is disposed at aY suitable distance below the cutting edge of the chisell and with its rearmost active face disposed parallel to the rear face of the chisel blade and spaced therefrom at a distance equal to the depth of the mortise. The chisel may then be p0- sitioned against the side face of a door, in the position shown particularly in Fig. 1 of the drawing with the cutting edge of the blade extending between the side cuts 4 of the mortise, the said side cuts having been made previously by suitable means. Then the chisel is driven by means of a mallet or other suitable striking tool (not shown), whereupon the wood intervening between the cuts 4 will be cut out, the blade during this operation being guided by the ange portions 23 andy limited in its extent of movement by the lugs 13.

What is claimed is:

The combination with a chisel having a blade provided with a cutting edge, of a gage device therefor comprising a pair of hooked members adapted to be positioned upon the blade, means for detachably wedging the hooked members to the opposite side edges of the blade, a pair of relatively spaced arms projecting outwardly and forwardly from the front face of each of said hooked members and formed integral with the outermost longitudinal edges thereof, the said arms being provided with longitudinally arranged slots, a gage member having a guide portion adapted to be disposed parallel to the blade, and clamping bolts mounted within the said slots of the arms and being engaged with the gage member, said gage member being provided with a longitudinal slot for the slidable reception of the said bolt members.

In testimony whereof I aiiix my signa Witnesses:

C. J. LUND, J. C. LUND.

Copies of this patent may be obtained forve cents each, by addressing the Commissioner of Patents,

' Washington, D. C. 

